Your mission -- should you choose to accept it -- is to watch the Brazilian premiere of 'Mission: Impossible - Ghost Protocol' at 4 p.m. EST right here at Moviefone. On hand for the festivities: Tom Cruise, the cast and crew of 'MI4' and Tiesto, a Dutch DJ who will be doing a remix of the 'Mission: Impossible' theme song. Fans will also be treated to some new clips and the dulcet tones of thousands of screaming Rio De Janeiro residents cheering on Mr. Cruise.